Flora of North America species comparison

30-120 cm;

nodes glabrous.

60-120 cm;

nodes pilose, with appressed hairs.

glabrous;

ligules shorter than 1 mm, of hairs;

blades to 25 cm long, 2-8 mm wide, flat, scabrous above.

glabrous or hispid;

ligules 1-2 mm, hispid;

blades 15-30 cm long, 6-15 mm wide, flat or folded, scabrous, often pubescent.

3-8 (10) cm, of uniform width throughout their length, densely spikelike;

rachises scabro-hispid;

bristles 4-12, 2-12 mm, antrorsely barbed, yellow to purple.

15-25 cm, open, tapering from the base;

rachises pubescent to villous;

lower branches to 3 cm;

bristles usually solitary, 10-35 mm, divergent.

2-2.8 mm, elliptical and turgid.

2.2-2.5 mm, elliptical.

glumes about 1/3 as long as the spikelets, 3-veined;

upper glumes 1/2 - 2/3 as long as the spikelets, 5-veined;

lower florets often staminate;

lower lemmas occasionally indurate and faintly transversely rugose;

lower paleas equaling the lower lemmas;

upper lemmas distinctly transversely rugose, often purple-tipped.

glumes about 1/2 as long as the spikelets, 3-veined;

upper glumes from 3/4 as long as to equaling the upper florets, 5-veined;

lower lemmas equaling the upper lemmas, 5-veined;

lower paleas about 1/2 as long as the upper paleas, lanceolate;

upper lemmas finely cross-wrinkled, shortly apiculate;

upper paleas ovate-lanceolate.

= 36, 72.

= 54.